Ministry of Earth Sciences
Yesterday’s very severe cyclonic storm NIVAR over southwest Bay of Bengal today weakened into a cyclonic storm in the morning
It would continue to move northwestwards and weaken further into a Deep Depression during next 06 hours and into a depression by subsequent 06 hours
Under its influence, rainfall at most/many places with heavy to very heavy falls at a few places and isolated extremely heavy falls likely to occur over Chittoor, Kurnool, Prakasam; Cuddappa districts of Andhra Pradesh and adjoining southeast Telangana on 26th Nov.
Heavy to very heavy rainfall at isolated places are very likely over north Tamilnadu, remaining districts of Andhra Pradesh and southeast Telangana.
Sea condition is very rough to high over Southwest Bay of Bengal, along & off north Tamil Nadu, Puducherry coast; rough to very rough over westcentral Bay of Bengal and along & off south Andhra Pradesh coast.
IMD advisestotal suspension of fishing operations
IMD :The system is under continuous surveillance and the concerned state governments are being informed regularly.
According to the Cyclone Warning Division of the India Meteorology Department, Delhi:
Cyclonic Storm “NIVAR” over southwest Bay of Bengal
Yesterday’s very severe cyclonic storm over southwest Bay of Bengal  moved northwestwards and crossed Tamilnadu and Puducherry coasts near Puducherry during 2330 IST of 25th to 0230 IST of 26th November as a very severe cyclonic storm with an estimated wind speed of 120-130 kmph gusting to 145 kmph. Continuing to move northwestwards, it weakened into a Severe Cyclonic Storm over north coastal Tamilnadu in the early morning hours  and further into a cyclonic storm in the morning  of today, the 26th November, 2020. It lay centred at 0830 hrs IST of today, the 26th November, 2020 over the same region near Lat. 12.6°N and Long 79.4°E, about 85 km north-northwest of Puducherry and about 95 km west-southwest of Chennai.
The Cyclonic Storm ‘NIVAR’ would continue to move northwestwards and weaken further into a Deep Depression during next 06 hours and into a depression by subsequent 06 hours.
Forecast track and intensity are given below:
|Date/Time
||Position 
||Maximum sustained surface wind speed 
||Category of cyclonic disturbance
|
|26.11.20/0830
||12.6/79.4
||70-80 gusting to 90
||
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Cyclonic Storm
|26.11.20/1130
||12.8/79.2
||60-70 gusting to 80
||
|
Cyclonic Storm
|26.11.20/1730
||13.2/78.8
||50-60 gusting to 70
||
|
Deep Depression
|26.11.20/2330
||13.6/78.4
||35-45 gusting to 55
||
|
Depression
|27.11.20/0530
||14.0/78.0
||20-30 gusting to 40
||
|
Low Pressure Area
Warnings:
 Rainfall
Under its influence, rainfall at most/many places with heavy to very heavy falls at a few places and isolated extremely heavy falls likely to occur over Chittoor, Kurnool, Prakasam; Cuddappa districts of Andhra Pradesh and adjoining southeast Telangana on 26th Nov. Heavy to very heavyrainfall at isolated places are very likely over north Tamilnadu, remaining districts of Andhra Pradesh and southeast Telangana.
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Sub-Divisions
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26 Nov 2020|
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27 Nov 2020|
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Coastal Andhra Pradesh
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Rainfall at most places with isolated heavy to very heavy falls over coastal Andhra Pradesh and isolated extremely heavy falls over south coastal Andhra Pradesh
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Rainfall at many places with heavy rainfall at isolated places
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Coastal &North InteriorTamilnadu, Puducherry &Karaikal
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Rainfall at many places with heavy rainfall at isolated places
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Rainfall at many places
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South Interior Karnataka
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Rainfall at many places with heavy rainfall at isolated places
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Rainfall at many places
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Rayalaseema
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Rainfall at most places with heavy to very heavy rainfall at a few places and extremely heavy falls at isolated places
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Rainfall at many places
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Telangana
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Rainfall at most places with heavy to very heavy rainfall and extremely heavy falls at isolated places over southeast Telangana
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Rainfall at many places
 Wind warning
- Gale wind speed reaching 70-80 kmph gusting to 90 kmph is prevailing over Southwest Bay of Bengal. It will gradually decrease becoming 50-60 kmph gusting to 70 kmph by evening of today, the 26thNovember, 2020.
- Gale wind speed reaching 70-80 kmph gusting to 90 kmph is prevailing along & off Puducherry, Villupuram, Chengalpattu, Kanchipuram, Chennai &Tiruvallu districts of north Tamil Nadu. It will gradually decrease becoming 50-60 kmph gusting to 70 kmph by evening and squally wind speed reaching 35-45 kmph gusting to 55 kmph by night of today, the 26thNovember, 2020.
- Squally wind speed reaching 45-55 gusting to 65 kmph very likely to prevail over interior districts  of Tamilnadu and Chittoor district of Andhra Pradesh till noon of today, 26thNovember, 2020 and gradual decrease thereafter.
- Squallywind speed reaching35-45 gusting to 55 kmph very likely over Nagapattinam, Karaikal, Myladuthurai, Cuddalore&Tiruvarurdistricts of Tamilnadu during next 06 hours and gradual decrease thereafter.
 Sea condition
- Sea condition is very rough to high over Southwest Bay of Bengal, along & off north Tamil Nadu, Puducherry coast. It will gradually become very rough to rough by afternoon of 26th Nov and improve further by night of 26th Nov.
- Sea condition is rough to very rough over westcentral Bay of Bengal and along & off south Andhra Pradesh coast. It will improve after 06 hours.
 Damage expected over Villupuram, Chengalpattu, Tiruvarur, Kanchipuram, Chennai, Tiruvallaur, Ranipet, Tiruvannamalai, Tirupattur, Vellore districts of Tamilnadu, Puducherry and Nellore & Chittoor districts of Andhra Pradesh during next 03 hours:
- Partial damage to thatched houses/ huts with possibility of roof tops being blown off and unattached metal sheets may fly.
- Partial damage to power and communication lines.
- Damage to Kutcha and some damage to Pucca roads. Flooding of escape routes.
- Breaking of tree branches, uprooting of small trees. Damage to banana and papaya trees, horticulture and crops & orchards.
viii) Fisherman Warning till evening of today, 26thNovember, 2020:
- Total suspension of fishing operations
- Movement in motor boats and small ships unsafe.
- Fishermen are advised not to venture into southwest & adjoining westcentral Bay of Bengal during next 12 hours.
 Action Suggested during next 03 hours:
- People in affected areas to remain in safe places and indoors.
- Judicious regulation of rail, road and air traffic.
- People are advised to remain indoors/in safe places and cooperate with state government officials and disaster management agencies.
Chief amounts of 24 hours past rainfall  ending at 0830 hours IST of today, the 26th November, 2020 recorded over Tamilnadu& Puducherry are given in Annexure 1: The system is under continuous surveillance and the concerned state governments are being informed regularly.
DWR Chennai Imagery based on 0930 IST of 26th November, 2020
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CYCLONIC STORM NIVAR
12.6N/79.4E
INSAT-3D Imagery based on 0800 IST of 26th November, 2020
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OBSERVED AND FORECAST TRACK ALONGWITH CONE OF UNCERTAINITY OF CYCLONIC STORM NIVAR OVER NORTH COASTAL TAMILNADU BASED ON 0300UTC OF 26TH NOVEMBER, 2020.
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OBSERVED AND FORECAST TRACK ALONGWITH QUADRANT WINDDISTRIBUTION OF CYCLONIC STORM NIVAR OVER NORTH COASTAL TAMILNADU BASED ON 0300UTC OF 26THNOVEMBER, 2020
Annexure 1
Chief amounts of 24 hours past rainfall  ending at 0830 hours IST of today, the 26th November, 2020 over Tamilnadu, Puducherry &Karaikal:
Tambaram  31, Pondicherry  30, Vilupuram  28, Cuddalore  27, DGP Office  26, Sholinganallur  22, Thamaraipakkam  19, Parangipettai  18, Pallipattu  17, Cholavaram  16, Gingee , Poonamallee , Ambathur , Mahabalipuram , Tiruvallur , Gummidipoondi  15 each,
Tindivanam , Maduranthagam , Chembarabakkam , Anna University , Vanur , Kollidam , Bhuvanagiri  14 each,
Mgr Nagar , Kancheepuram , Kurinjipadi , Alandur , Chidambaram Aws , Red Hills , Marakkanam , Chengalpattu , Tiruttani , Chidambaram  13 each,
Ulundurpet , Poondi , Vadapudupattu , Keelpennathur , Koratur , Sirkali  12 each,
Chennai Ap , Vandavasi , Sethiyathope , Vembakkam , PoonamalleArg , Arakonam , Thirukalukundram , Sriperumbudur , Panruti  11 each,
Ponneri , Arcot , TaramaniArg , Perambur , Uthiramerur , Sholingur , Cheyyur  10 each,
Anna UtyArg , ChembarambakkamArg , Thiruvalangadu , Tirukoilur , Polur , Mayiladuthurai , Thirupporur , Kelambakkam , Karaikal , Manalmedu , PuzhalArg  9 each,
Arani , Chennai , Hindusthan University , Vepur , Vridhachalam , Ammundi , Vellore , R.k.pet , Kodavasal , Manjalaru  8 each,
Uthukottai , AgaramSeegoor , Kaveripakkam , Ambur , TiruttaniPto , Tozhudur , Tarangambadi , Pelandurai , Tiruvannamalai , Srimushnam , Ennore Aws , Needamangalam , Sendurai , Cheyyar , Katpadi , Aduthurai Aws  7 each.
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